Flutter Pub Run Build Runner Build Not Working

When developing with Flutter, sometimes you may encounter issues with the flutter pub run build_runner build command. This command is used to generate code that is needed for your application to work properly, such as files for JSON serialization.

If you are having trouble getting this command to work, there are a few things you can try to troubleshoot the issue:

1. Make sure your project has a pubspec.yaml file with the appropriate dependencies listed. You will need to have the build_runner and json_serializable dependencies added to your project. You can do this by adding the following to your pubspec.yaml file:

   dependencies:
     # ... other dependencies ...
     build_runner: ^2.0.2
     json_serializable: ^5.0.0
   
   dev_dependencies:
     # ... other dev dependencies ...
     build_runner: ^2.0.2
     json_serializable: ^5.0.0
   

2. Make sure you have the latest version of Flutter installed. You can check for updates by running the command flutter upgrade.

3. Check that you have the latest version of the build_runner and json_serializable dependencies installed. You can do this by running the command flutter pub outdated.

4. If you still have issues, try running the command with the verbose flag (-v). This will give you more detailed information about any errors or issues that are occurring.

5. If you're still stuck, try removing the .dart_tool folder from your project directory and running the command again. Sometimes this folder can become corrupted and cause issues.

Hopefully one of these steps will help you get flutter pub run build_runner build working again. Happy coding!

# To add dependencies to pubspec.yaml
dependencies:
  # ... other dependencies ...
  build_runner: ^2.0.2
  json_serializable: ^5.0.0

dev_dependencies:
  # ... other dev dependencies ...
  build_runner: ^2.0.2
  json_serializable: ^5.0.0

# To check for updates
flutter upgrade

# To check outdated dependencies
flutter pub outdated

# To run with verbose flag
flutter pub run build_runner build -v